Re: How to prep for polishing?
OK, I realize you can't give an exact measurement without a lot more info. How about asking it this way: Given a smooth to the touch surface, but not "polished", how much metal typically is removed to get a high polish (aluminum in this case). Or maybe another way to think about it, what grit of sanding scratches are easily removed by the sisal wheel/black compoud in aluminum (320, 600, 1200, ...)?
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